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I'm a victim of funny prank: From time to time colleague uses "Lock computer" remotely over the network. How can I protect against it? How is he doing it? What information he must have? I guess he must know my password, machine name. Correct?

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disable remote access to the computer. If he is the admin of the domain then there is nothing you can do to prevent it. –  Ramhound Jul 31 '13 at 11:17
    
If he is a domain admin and you are a user, nothing. Chances are he is remotely running c:\Windows\System32\rundll32.exe user32.dll,LockWorkStation. Since you can't exactly delete or rename the rundll32.exe, doing that wont work. –  francisswest Jul 31 '13 at 17:51

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